Bibliografie tematiche / Dune morphodynamics

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Letteratura scientifica selezionata sul tema "Dune morphodynamics"

Autore: Grafiati
Pubblicato: 25 gennaio 2025

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Articoli di riviste sul tema "Dune morphodynamics"

1

Courrech du Pont, Sylvain. "Dune morphodynamics". Comptes Rendus Physique 16, n. 1 (gennaio 2015): 118–38. http://dx.doi.org/10.1016/j.crhy.2015.02.002.

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Naqshband, Suleyman, Bas Wullems, Timo de Ruijsscher e Ton Hoitink. "Experimental investigation of low-angle dune morphodynamics". E3S Web of Conferences 40 (2018): 02056. http://dx.doi.org/10.1051/e3sconf/20184002056.

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Abstract (sommario):
Dunes commonly dominate the bed of sandy rivers and they are of central importance in predicting flow resistance and water levels. In the present study, we show that by using light-weight polystyrene particles as substrate in a laboratory setting, promising morphodynamic similarity is obtained between dunes in shallow flow (flume) and deep flow (field) conditions. In particular, results from our flume experiments show that dune lee-side angles, which are crucial in turbulence production and energy dissipation, better approximate dune lee-side angles observed in natural channels. Furthermore, dune height evolution towards upper stage plane bed observed in the present experimental study, closely follows dune height evolution as observed in world’s large rivers.
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Hoonhout, Bas, e Jaap Van Thiel de Vries. "MODELLING DUNE EROSION, OVERWASH AND INUNDATION OF BARRIER ISLANDS". Coastal Engineering Proceedings 1, n. 33 (25 ottobre 2012): 30. http://dx.doi.org/10.9753/icce.v33.sediment.30.

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Physical model experiments are performed at Deltares to investigate the morphological response of barrier islands on extreme storm events. The experiments included dune erosion, overwash and inundation regimes. Extensive measurement techniques made detailed comparison with numerical models possible. This paper describes the comparison between the physical model results and the numerical morphodynamic model XBeach. It appeared that XBeach simulates the main characteristics in hydro- and morphodynamics at profiles with shallow foreshores, which are characteristic for barrier islands, well. However, the absolute results of especially the overwash experiments still do not agree with the measurements. It is expected that several generic issues regarding small-scale physical model experiments are of influence here. Nevertheless, calibration of the XBeach model seems to be necessary for shallow profiles. Especially the calibration of the wave characteristics on the shallow foreshore, related to the morphodynamics is far from trivial.
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D’Alessandro, Felice, Giuseppe Roberto Tomasicchio e Ferdinando Frega. "Beach-Dune System Morphodynamics". Journal of Marine Science and Engineering 10, n. 6 (10 giugno 2022): 802. http://dx.doi.org/10.3390/jmse10060802.

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Coastal dunes are known for their functions in ecological systems in addition to their aesthetic qualities, providing a highly valuable and unique habitat of due to their biodiversity of flora and fauna [...]
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D’Alessandro, Felice, Giuseppe Roberto Tomasicchio, Ferdinando Frega, Elisa Leone, Antonio Francone, Daniela Pantusa, Giuseppe Barbaro e Giandomenico Foti. "Beach–Dune System Morphodynamics". Journal of Marine Science and Engineering 10, n. 5 (5 maggio 2022): 627. http://dx.doi.org/10.3390/jmse10050627.

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Beach–dune system morphodynamics is probably one of the most classical coastal engineering problems. While the topic has been studied extensively and literature is plentiful of considerable research contributions, from the authors’ knowledge the subject is still challenging for coastal and environmental sciences. As a part of the Special Issue entitled “Beach–dune system morphodynamics” of this Journal, the present paper reviews traditional issues and design advances building bridges between potential risks and adaptation measures. The benefits of nature-based and hybrid solutions and the need for multidisciplinary studies and approaches to promote sustainable and resilient conservation of the coastal environment are emphasized. Considering the importance and complexity of the subject, this work cannot be fully complete. It is limited to providing a general overview and outlining some important directions intending to serve as a springboard for further research in the field of beach–dune system morphodynamics.
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Darke, Ian B., Ian J. Walker e Patrick A. Hesp. "Beach-dune sediment budgets and dune morphodynamics following coastal dune restoration, Wickaninnish Dunes, Canada". Earth Surface Processes and Landforms 41, n. 10 (8 marzo 2016): 1370–85. http://dx.doi.org/10.1002/esp.3910.

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Wilson, Kat, e David Mohrig. "Signatures of Pleistocene Marine Transgression Preserved in Lithified Coastal Dune Morphology of The Bahamas". Geosciences 13, n. 12 (28 novembre 2023): 367. http://dx.doi.org/10.3390/geosciences13120367.

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The morphology of some lithified wind-blown, carbonate dunes in The Bahamas preserves the signature of erosion from paleo-marine processes: wave-induced swash, scarping, and longshore transport. Digital elevation models were used to distinguish between two dune morphotypes—those disconnected versus connected to beach processes. Dune sinuosity and upwind slope were quantified and used to interpret which dunes remained beach-attached and subject to marine erosion and processes versus dunes that became disconnected from the shoreline via inland migration or shoreline regression. Disconnected dunes possess low slopes over stoss surfaces with sinuous planforms mimicking their crestlines. Beach-connected foredunes preserve steep, kilometers-long linear upwind faces, which are interpreted to be signatures of beach-dune morphodynamics. Foredune morphology serves as a proxy for shoreline position during past sea-level high-stands, while the basal elevations of their stoss dune toes provide an upper limit on the beach and adjacent sea level. A growing library of digital topography will allow for this tool to be used to interpret global paleo-shoreline positions through time and space.
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Bastos, Ana Pestana, Rui Taborda, César Andrade, Cristina Ponte Lira e Ana Nobre Silva. "Short-Term Foredune Dynamics in Response to Invasive Vegetation Control Actions". Remote Sensing 16, n. 9 (23 aprile 2024): 1487. http://dx.doi.org/10.3390/rs16091487.

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Efforts to control the spread of invasive alien species (IAS) in coastal dunes are essential to protect biodiversity and maintain the integrity of the ecosystem. However, the timing and extent of these control measures often do not consider their potential impact on dune morphodynamics. This study investigated how IAS control measures can affect sand dune mobility. Research involved monitoring short-term morphological and vegetation changes using close-range remote sensing along with historical wind data. Findings revealed that changes in vegetation cover significantly impacted dune system evolution, notably increasing sand mobility when IAS vegetation was removed. Considering the seasonal wind regime, dominated by offshore winds in the summer, removing vegetation during this period can promote seaward sediment transport, potentially resulting in sediment loss to the beach. These findings highlight the importance of understanding sediment mobility patterns when planning vegetation control actions within dune restoration strategies.
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Maximiliano-Cordova, Carmelo, Rodolfo Silva, Edgar Mendoza, Valeria Chávez, M. Luisa Martínez e Rusty A. Feagin. "Morphological Performance of Vegetated and Non-Vegetated Coastal Dunes with Rocky and Geotextile Tube Cores under Storm Conditions". Journal of Marine Science and Engineering 11, n. 11 (28 ottobre 2023): 2061. http://dx.doi.org/10.3390/jmse11112061.

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Coastal dune restoration projects are increasingly seen as a means of protecting the coast against storms, especially with the use of natural (plants), artificial (geotextile tube cores) and hybrid (plants and geotextile tube) elements. As geotextile tube cores have been found to negatively affect dune and beach natural morphodynamics, rocky cores are thus seen as a potential alternative. We carried out laboratory experiments to compare the performance of dunes with rocky cores, geotextile cores, and both types when coupled with planted vegetation. We investigated these elements in the context of scaled mild, moderate, and intense storm conditions. The results showed that dunes with either type of core lost more sand than dunes without cores. The addition of plants generally reduced the erosion across the various options, but most strongly for rocky cores under mild and moderate storm conditions. We also found that dunes with a high density of plants were best for intense conditions. Overall, the use of rocky dune cores, when coupled with plants, is the most suitable and sustainable alternative option in hybrid engineering projects.
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Duo, Enrico, Stefano Fabbri, Edoardo Grottoli e Paolo Ciavola. "Uncertainty of Drone-Derived DEMs and Significance of Detected Morphodynamics in Artificially Scraped Dunes". Remote Sensing 13, n. 9 (7 maggio 2021): 1823. http://dx.doi.org/10.3390/rs13091823.

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This work capitalises on the morphodynamic study of a scraped artificial dune built on the sandy beach of Porto Garibaldi (Comacchio, Italy) as a barrier to protect the touristic facilities from sea storms during the winter season and contributes to understanding of the role of elevation data uncertainty and uniform thresholds for change detection (TCDs) on the interpretation of volume change estimations. This application relies on products derived from unmanned aerial vehicle (UAV) surveys and on the evaluation of the uncertainty associated with volume change estimations to interpret the case study morphodynamics under non-extreme sea and wind conditions. The analysis was performed by comparing UAV-derived digital elevation models (DEMs)—root mean squared error (RMSE) vs. global navigation satellite system (GNSS) < 0.05 m—and orthophotos, considering the significance of the identified changes by applying a set of TCDs. In this case, a threshold of ~0.15 m was able to detect most of the morphological variations. The set of TCD ≤ 0.15 m was considered to discuss the significance of minor changes and the uncertainty of volume change calculations. During the analysed period (21 December 2016–20 January 2017), water levels and waves affected the front of the artificial dune by eroding the berm area; winds remodelled the entire dune, moving the loose sand around the dune and further inland; sediment volumes mobilised by sea and wind forcing were comparable. This work suggests that UAV-derived coastal morphological variations should be interpreted by integrating: (i) a set of uniform thresholds to detect significant changes; (ii) the uncertainty generated by the propagation of the original uncertainty of the elevation products; (iii) the characteristics of the morphodynamic drivers evaluated by adopting uncertainty-aware approaches. Thus, the contribution of subtle morphological changes—magnitudes comparable with the instrumental accuracy and/or the assessed propagated uncertainty—can be properly accounted for.
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Più fonti

Tesi sul tema "Dune morphodynamics"

1

Neal, Adrian. "Sedimentology and morphodynamics of a Holocene coastal dune barrier complex, northwest England". Thesis, University of Reading, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.359524.

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2

Montreuil, Anne-Lise. "Aeolian dune development and evolution on a macro-tidal coast with a complex wind regime, Lincolnshire coast, UK". Thesis, Loughborough University, 2012. https://dspace.lboro.ac.uk/2134/10609.

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Abstract (sommario):
Coastal foredunes are natural aeolian bedforms located landward of the backshore and which interact continuously with the beach. Traditionally, coastal dunes have been associated with onshore winds, however they can be found under more complex wind regimes where offshore winds are common such as the UK East coast, Northern Ireland and New Zealand. This research investigates the ways in which foredune-beach interactions occur under a complex wind regime at a range of overlapping temporal and spatial scales and is innovative in that it explicitly links small-scale processes and morphodynamic behaviour to large scale and long-term dynamics. The study area is the north Lincolnshire coast, East England. Detailed observations of airflow at three locations under varying wind regimes revealed considerable spatial variations in wind velocity and direction, however it was possible to determine a general model of how foredune topography deflected and modified airflow and the resultant geomorphological implications (i.e. erosion and deposition). During direct offshore and onshore winds, airflow remained attached and undeflected; and distinct zones of flow deceleration and acceleration could be identified. During oblique winds airflow was deflected to become more parallel to the dune crest. The field sites used are characterized by a seasonal erosion/accretion cycle and a series of increasingly complex models was developed and tested to determine whether it was possible to predict sand volume changes in the foredune-beach system based on a limited number of variables. The model predictions were tested against detailed digital terrain models at a seasonal timescale. The model prediction that best matched the observed (surveyed) sand volume changes included wind speed, direction, grain size, fetch effect controlled by beach inundation and angle of wind approach was accurate to within ±10% for 18 out of 48 tests at the seasonal scale and 6 out of 12 tests over periods of >5 years. A key variable influencing foredune-beach sand volume is the magnitude and frequency of storm surge events and this was not factored in to the model, but may explain the model-observation mismatch over the medium-term on two occasions. Over the past 120 years historical maps and aerial photographs indicate long-term foredune accretion of approximately 2 m year-1 at the three study sites (1891-2010). At this timescale, rates of coastal foredune accretion reflect the low occurrence of severe storm surges and suggest rapid post-storm recovery. The morphological response of the foredune-beach morphology is considered to be a combination of controlling and forcing factors. Process-responses within the system, associated with nearshore interactions and sediment transfer from the littoral drift, are compiled into a multi-scale morphodynamic model. Important to match appropriate dataset to scale of research question or management plan being explored. In the case of management, long-term records of past activity are necessary to predict the future but also to understand natural responses of system to short-term impact such as storm surge.
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Daynac, Jimmy. "Contribution de l'Intelligence Artificielle à la cartographie pour l'analyse des dunes à l'échelle d'un désert : cas d'étude du Rub'Al Khali". Electronic Thesis or Diss., Le Mans, 2024. http://www.theses.fr/2024LEMA1027.

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Les dunes de sable éoliennes à différentes échelles (m-km) sont les principales formes topographiques dans les systèmes éoliens et se retrouvent sur divers corps planétaires comme la Terre, Mars ou Vénus. Elles résultent de l'interaction entre le vent, les sédiments transportés et le substratum. La forme, la taille, la disposition spatiale et le déplacement des dunes permet d'analyser les interactions entre les flux d'air et l'apport de sédiments, modulés par les conditions de surface. La production de cartes détaillées des caractéristiques individuelles des dunes couplée à une analyse statistique morphométrique spatialisée devient donc nécessaire pour mieux comprendre et caractériser l'origine de la formation et de l'évolution des dunes éoliennes.Cependant, cartographier les dunes avec précision sur de grandes étendues reste encore aujourd'hui une tâche difficile pour deux raisons. Tout d'abord, compte tenu de la disponibilité des ensembles de données de télédétection avec une résolution spatiale (et temporelle) toujours croissante, une telle cartographie nécessite des procédés automatisés car la numérisation manuelle i) est chronophage et ii) peut être d'une subjectivité et d'une qualité non-uniformes. Ces limites sont principalement dues au fait que les opérateurs humains ne peuvent pas suivre des critères de cartographie similaires sur de vastes zones d'étude, en particulier lorsqu'il s'agit de morphologies complexes. Ensuite, cette cartographie se révèle ardue ; notamment en raison de la complexité de certaines formes et de l'absence de classification universellement acceptée des dunes, malgré les efforts de recherche récents.Ce travail a donc pour objectif premier de proposer une nouvelle méthode de cartographie des dunes éoliennes axée sur une approche couplant du Deep Learning pour tracer le contour des dunes, une "squelettisation" et une analyse de réseau pour cartographier leurs crêtes et leurs connectivités (défauts). L'originalité de cette étude réside dans la capacité à cartographier ces caractéristiques à différentes échelles, allant de quelques kilomètres au désert entier. Les algorithmes développés montrent d'excellentes performances pour analyser des zones géographiques étendues et complexes avec une précision de l'ordre de 90 %. Cette méthode a permis de créer, pour la première fois, une base de données de plusieurs milliers de dunes du désert du Rub'Al Khali (le plus grand désert actif au monde), avec une fidélité élevée par rapport aux observations visuelles des dunes présentes sur le MNT.À partir de cette base de données, nous avons étudié la variabilité morphologique des dunes en les comparant avec les données de vent (ERA5 Land Reanalysis) à l'échelle du désert, afin de quantifier et de comprendre leurs changements morphologiques et leurs répartitions spatiales en lien avec la dynamique des vents. Cette analyse morphométrique spatialisée est basée sur une Analyse en Composante Principale (ACP) et met en évidence les paramètres dominants suivant : la longueur des dunes (PC1) explique plus de 50 % de la variance et décrit les dunes linéaires du SW du désert ; la hauteur (PC2) représente 18 % de la variance et décrit les dunes en croissant du NW ; et la densité de défauts (PC3) explique 14 % de la variance, représentant les dunes en étoile et en dôme au SE. Des tests de p-value ont aussi été réalisés sur ces paramètres et révèlent des valeurs inférieures à 0,05, confirmant ainsi une organisation spatiale significative des dunes à l’échelle du désert.Chaque forme archétypale de dune est dominée par l'un des trois paramètres identifiés par l'ACP, et les transitions entre ces formes représentent des étapes évolutives. En comparant ces résultats avec les données de vent, nous obtenons un modèle évolutif où la forme, la taille et l'orientation des dunes sont fortement influencées par les caractéristiques directionnelles du flux de sable associés aux vents du Shamal et du Kharif.(...)
Aeolian dunes at different scales (m-km) are the primary topographic forms in aeolian systems and are found on various planetary bodies such as Earth, Mars, or Venus. They result from the interaction between wind, transported sediments, and the substrate. The shape, size, spatial arrangement, and movement of dunes allow for the analysis of interactions between airflows and sediment supply, modulated by surface conditions. The production of detailed maps of individual dune characteristics, coupled with spatial morphometric statistical analysis, is thus necessary to understand better and characterize the origin of dune formation and evolution.However, accurately mapping dunes over large areas remains a challenging task today for two reasons. Firstly, considering the availability of remote sensing datasets with ever-increasing spatial (and temporal) resolution, such mapping requires automated processes since manual digitization i) is time-consuming and ii) can be subjective and of uneven quality. These limitations are mainly because human operators cannot maintain consistent mapping criteria across large study areas, especially when dealing with complex morphologies. Secondly, this mapping is challenging, particularly due to the complexity of some forms and the lack of a universally accepted dune classification, despite recent research efforts.The primary objective of this work is to propose a new method for mapping aeolian dunes, focusing on an approach that couples Deep Learning to delineate the dune outlines, "skeletonization," and network analysis to map their crestlines and connectivities (defects). The originality of this study lies in the ability to map these features at various scales, ranging from a few kilometers to entire deserts. The developed algorithms demonstrate excellent performance in analyzing large and complex geographic areas with an accuracy of around 90%. This method has enabled the creation, for the first time, of a database containing several thousand dunes from the Rub'Al Khali desert (the largest active desert in the world), with high fidelity compared to visual observations of the dunes present in the Digital Elevation Model (DEM).From this database, we studied the morphological variability of the dunes by comparing them with wind data (ERA5 Land Reanalysis) on a desert scale, in order to quantify and understand their morphological changes and spatial distributions in relation to wind dynamics. This spatialized morphometric analysis is based on Principal Component Analysis (PCA) and highlights the dominant parameters as follows: dune length (PC1) explains more than 50% of the variance and describes the linear dunes in the SW of the desert; height (PC2) represents 18% of the variance and describes the crescent-shaped dunes in the NW; and defect density (PC3) explains 14% of the variance, representing star and dome dunes in the SE. P-value tests were also conducted on these parameters and revealed values below 0.05, thus confirming a significant spatial organization of dunes at the desert scale.Each archetypal dune form is dominated by one of the three parameters identified by the PCA, and transitions between these forms represent evolutionary stages. By comparing these results with wind data, we obtain an evolutionary model in which dunes shape, size, and orientation are strongly influenced by the directional characteristics of sand flow associated with the Shamal and Kharif winds. The analysis of wind data to the different statistically defined dune populations also revealed two dune growth modes: an elongation mode in the west, where the crests of linear dunes align with the sediment flow, favoring their stretching, and an instability mode in the east, where isolated and crescentic dunes, perpendicular to the flow, optimize their vertical growth
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4

Al-Enezi, A. "Morphodynamics and sedimentology of falling dunes in north east Kuwait". Thesis, Royal Holloway, University of London, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249315.

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Jay, Helen. "Beach-dune sediment exchange and morphodynamic responses : implications for shoreline management, the Sefton coast, NW England". Thesis, University of Reading, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.265173.

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Burvingt, Olivier Jean-Patrick. "Storm impact and recovery along the south west coast of England". Thesis, University of Plymouth, 2018. http://hdl.handle.net/10026.1/12830.

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Extreme storms are responsible for rapid changes to coastlines worldwide. During the 2013/14 winter, the west coast of Europe experienced a sequence of large, storm-induced wave events, representing the most energetic period of waves in the last 60 years. The southwest coast of England underwent significant geomorphological change during that period, but exhibited a range of spatially variable and complex morphological responses, despite being subjected to the same storm sequence. The 2013/14 storm response along the southwest coast of England was first used as a natural field laboratory to explain the variability in storm response through the introduction and evaluation of a new classification of how sandy and gravel beaches respond to extreme storms. Cluster analysis was conducted using an unique data set of pre- and post-storm airborne Light Detection and Ranging (LiDAR) data from 157 beach sites and the calculation of volumetric beach changes and a novel parameter, the longshore variation index which quantifies the alongshore morphological variability in beach response. The method used can be applied to any sandy and gravel beaches where topographic data with sufficient spatial resolution is available. Four main beach response types were identified that ranged from large and alongshore uniform offshore sediment losses up to 170 m3 m-1 (at exposed, cross-shore dominated sites) to considerable alongshore sediment redistribution but limited net sediment change (at more sheltered sites with oblique waves). The key factors in determining the type of beach response are: exposure to the storm waves, angle of storm wave approach and the degree to which the beach is embayed. These findings provide crucial information for the development of coastal studies at regional scale, especially along coastal areas where abrupt changes in coastline orientation can be observed. A 10-year time series (2007-2017) of supra- and intertidal beach volume from exposed and cross-shore transport-dominated sites was used to examine the extent to which beach behaviour is coherent over a relatively large region (100-km stretch of coast) and predictably coupled to incident wave forcing. Over the study period, 10 beaches, exposed to similar wave/tide conditions, but having different sediment characteristics, beach lengths and degrees of embaymentisation, showed coherent and synchronous variations in sediment volumes, albeit at different magnitudes. This result is crucial for studying coastal changes in remote coastal areas or in areas where only few topographic data are available. The sequence of extreme storms of the 2013/14 winter, which represents the most erosive event over at least a decade along most of the Atlantic coast of Europe, is included in the data set, and three years after this winter, beach recovery is still on-going for some of the 10 beaches. Post-storm beach recovery was shown to be mainly controlled by post-storm winter wave conditions, while summer conditions consistently contributed to modest beach recovery. Skilful hindcasts of regional changes in beach volume were obtained using an equilibrium-type shoreline model, demonstrating that beach changes are coherently linked to changes in the offshore wave climate and are sensitive to the antecedent conditions. Furthermore, a good correlation was found between the beach volume changes and the new climate index WEPA (West Europe Pressure Anomaly), which offers new perspectives for the role and the use of climatic variations proxies to forecast coastline evolution. A process based model, XBeach, was used to model storm response at one macrotidal beach characterized by the largest sediment losses during the 2013/14 sequence of extreme storms. Beach volume changes were modelled over hypothetical scenarios with varying hydrodynamics conditions and beach states to investigate the relative roles of hydrodynamic forcing (i.e., waves and tides), beach antecedent state and beach-dune morphology in beach response to extreme storms. This modelling approach is applicable to any beach system where process based models have been implemented. Beside significant wave height and peak wave period, the beach antecedent state was shown to be the dominant factor in controlling the volumes of sediment erosion and accretion along this cross-shore dominated beach. Modelled volumes of erosion were, on average, up to three times higher along an accreted beach compared to an eroded beach for the same wave conditions. The presence of a dune, being only significantly active during spring tides and storm conditions along this macrotidal beach, was shown to reduce erosion or even cause accretion along the intertidal beach. This work provides a detailed, quantitative insight of the hydrodynamic and morphological processes involved in storm response and beach recovery on a number of spatial and temporal scales. This improved understanding of the potential impact of extreme events will hopefully aid future research efforts and ensure effective management of sedimentary coastlines.
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Doré, Arnaud. "Modélisation de l'évolution morphodynamique des dunes sous-marines". Thesis, Bordeaux, 2015. http://www.theses.fr/2015BORD0379/document.

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Abstract (sommario):
Les dunes de sable sont des formes très présentes en milieu marin. Comprendre l'évolution des dunes est un enjeu important pour prévoir les caractéristiques de l'écoulement, les flux sédimentaires, et les variations de la bathymétrie. Les dunes sous-marines représentent un risque pour les activités humaines, a fortiori avec l'intérêt croissant pour les énergies marines renouvelables, pour la navigation, ou l'industrie offshore. Bien que la connaissance des dunes représente un intérêt scientifique et opérationnel de premier ordre, les processus physiques conduisant leur évolution sont toujours mal compris. En outre, la prévision de leurs caractéristiques géométriques et de leur dynamique basée essentiellement sur des formules empiriques reste peu précise. Dans ce travail de thèse, un modèle numérique est d'abord utilisée pour modéliser les dunes soumises à un écoulement stationnaire. Les simulations reproduisent l'évolution d'un fond faiblement perturbé jusqu'à un champ de dunes en équilibre avec l'écoulement et apportent des connaissances approfondies sur les processus physiques mis en jeu. Ensuite, les résultats d'un ensemble de campagnes de mesures réalisées dans la passe sud du bassin d'Arcachon permettent d'étudier la dynamique des dunes tidales in situ et relier leur asymétrie et leur migration aux résiduels de transport sédimentaire. Enfin, l'application du modèle numérique avec les conditions de forçages extraites des campagnes de mesures permet de reproduire la dynamique des dunes tidales ainsi que la génération de rides d'un ordre de grandeur comparable aux rides surimposées observées in situ. Ces résultats ouvrent des perspectives intéressantes en vue du développement d'un modèle opérationnel de prévision de la dynamique des dunes tidales
Sand dunes are ubiquitous beforms in nature within subaqueous environments. Understanding dune evolution is important issue to accurately predict the ow circulation, sediment uxes and bathymetric variations in sandy subaqueous environments. Sand dunes may pose a significant risk for offshore activities in coastal environments, especially with the growing development of renewable marine energy, for navigation or the offshore industry. Although sand dunes represent a great scientific and operational interest, their evolution is still poorly understood due to their complex behavior. The aim of the thesis work was to study the physical processes driving the evolution of subaqueous sand dunes and to understand their in situ dynamics within tidal environments. First, a numerical model was employed to simulate sand dunes under stationary current conditions. The simulations reproduced the morphodynamic evolution of a slightly perturbed bed until a steady sand dune field in equilibrium with the ow. The results offered a deeper understanding of the physical processes driving the bed evolution to equilibrium. Second, an array of in situ measurements was carried out into the Arcachon inlet, in southwest France, to study the dynamics of tidal sand dunes. For the first time their asymmetry and migration rates were linked to the sediment uxes residuals on a spring-neap tidal cycle. Finally, the numerical model was adapted both to simulate the dynamics of tidal sand dunes, and generate bedforms of the same order of magnitude as the in situ dune-superimposed ripples starting from a at bed. These results open promising perspectives for the development of a numerical tool capable of predicting the behavior of sand dunes within tidal environments
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Kubicki, Adam [Verfasser]. "Significance of sidescan sonar data in morphodynamics investigations on shelf seas : case studies on subaqueous dunes migration, refilling of extraction pits and sorted bedforms stability / Adam Kubicki". Kiel : Universitätsbibliothek Kiel, 2008. http://d-nb.info/1019660244/34.

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9

Zemmour, Amar. "Étude de l'évolution des littoraux dunaires de la Côte d'Opale à différentes échelles de temps : analyse de leur capacité de régénération post-tempête". Thesis, Littoral, 2019. http://www.theses.fr/2019DUNK0525/document.

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Les dunes côtières constituent un des éléments fondamentaux de la dynamique des systèmes côtiers sableux. Leur stabilité dépend essentiellement de leur capacité à résister aux effets des tempêtes et à se reconstituer après l'érosion. Dans le contexte actuel du changement climatique, la probable hausse du niveau de la mer devrait affecter considérablement les systèmes côtiers et de surcroît augmenter la vulnérabilité des cordons dunaires à l'érosion.L'objectif principal de cette thèse est d'étudier l'évolution des littoraux dunaires de la Côte d'Opale en adoptant une approche à plusieurs échelles de temps afin d'évaluer leur capacité de résistance et/ou de régénération face aux événements tempétueux. A long terme, l'étude de l'évolution du trait de côte sur près de 68 ans, à partir de photographies aériennes orthorectifiées, a révélé que plus de la moitié des littoraux dunaires de la Côte d'Opale sont stables ou en accumulation et possèdent donc une bonne capacité de résilience, malgré les nombreuses tempêtes ayant affecté ce littoral depuis le début des années 50. L'analyse de leur évolution sur un pas de temps de 5 ans a mis en évidence une forte variabilité spatiale et temporelle directement liée aux forçages météo-marins, notamment aux épisodes tempétueux associés à des hauts niveaux d'eaux. A moyen et court termes, des levés topographiques LiDAR et des mesures in-situ, couplés aux données météorologiques et hydrodynamiques, ont révélé une réponse morphologique différente entre des secteurs dunaires adjacents. Celle-ci est liée à la variation des paramètres morphologiques (altitude de pied de dune, largeur et volume du haut de plage) au cours des périodes étudiées. Les résultats montrent également que les processus de régénération peuvent être très longs sur nos sites d'étude, ce qui suggère que les dunes cotières qui, jusqu'à présent étaient relativement stables, risquent de connaître des épisodes d'érosion plus fréquents avec l'élévation contemporaine du niveau de la mer
Coastal dunes are fundamental elements of sandy coastal systems dynamic. They may experience a variable response to coastal erosion, in relation to their ability to withstand storm effects and to recover from erosion. Global sea level rise, related to global warming, would considerably affect coastal systems and hence the sensitivity of coastal dunes to erosion. The main objective of this thesis is to study the evolution of the Côte d'Opale coastal dunes at different time scales in order to evoluate their capacity to resist and/or to recover from storm impacts. Over long term periods (nearly 68 years), shoreline evolution analysis from orthorectified aerial photographs revealed that more than half of the Côte d'Opale coastal dunes are stable or prograding and thus, are resilient. Their evolution over 5-year periods highlighted a strong spatial and temporal variability which is directly linked to weather and hydrodynamic conditions, especially the occurence of storms during heigh water levels. At medium and short term scales, topographic surveys from LiDAR and in-situ measurements, coupled with metrological and hydrodynamic data, showed a different morphological response between adjacent coastal dune areas. This is related to variations in morphological parameters such as dune foot elevation, width and volume of the upper-beach during the studied periods. Results show also that coastal dunes recovery from storms can be a very long process at our study areas, suggesting that foredunes in a state of mesoscale stability may experience more frequent erosion with currents sea level rise
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Malta, J?lia Varella. "Experimento de fluxo de sedimentos em um segmento de campo de dunas e?licas costeiras de Jenipabu - Litoral oriental do Rio Grande do Norte". Universidade Federal do Rio Grande do Norte, 2012. http://repositorio.ufrn.br:8080/jspui/handle/123456789/18831.

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This study analyzed measurements of the aeolian transport using vertical sand traps across the field dunes of Jenipabu, in the municipality of Extremoz, Rio Grande do Norte state to the North of Natal city. These measurements were used as parameters for the sand aeolian transport in the region. Before the field trips a map of landscape units was made. Three visits to the field were done in September 2011 (field a - the 13th, field b - the 21st, field c - the 29th), period of the year with the highest wind speed, and another in December 8th, 2011 (field d ) when the wind speed starts to decrease. The sand traps used were of the type "I" with collecting opening of 25 cm from the surface level, and type "S" with collecting opening of 25 cm located 25 cm from the surface level in six collecting points in two of the visits (fields a and d ), and sand traps of the type "T" with the collecting opening of 50 cm from the surface level in the other field trips (fields "b" and "c"). A set of records was also collected by using a portable meteorological station complemented with information such as frequency and intensity of winds, precipitation and relative air humidity in the region, from the Esta??o Meteorol?gica de Natal , located 12 km from the study area. The sediments collected were treated and the data obtained permitted calculating the ratio of sediment transport. In September, the sedimentation ratio varied from 0.01 to 11.39 kg.m-1.h-1 and in December this ratio varied from 0.33 to 1.30 kg.m-1.h-1 in the type T collectors. In type I collectors they ranged from 0.01 to 11.39 kg.m-1.h-1, while the same parameters varied from 0.01 to 0.73 kg.m-1.h-1 in type S collector. Based on the statistical analysis done, we concluded that the sediment transport increased proportionally to the wind speed 25 cm from the surface. However, this is not true above 25 cm from the surface. The transport of sediments is more intense near the surface where sedimentation ratios greater than 10 kg.m-1.h-1 were found, whilst a maximum value of 3 kg.m-1.h-1 was observed 25 cm below the surface. The volume of sediments collected increases with the increasing wind speed at the surface level, whereas this relationship is opposed far away from that surface
O presente estudo fez a an?lise de medidas de transporte e?lico utilizando coletores de areia verticais (Sand Traps) ao longo de um campo de dunas na praia de Jenipabu, munic?pio de Extremoz no estado do Rio Grande do Norte ao Norte da cidade de Natal. Estas medidas foram utilizadas como par?metro de avalia??o da movimenta??o e?lica nesta regi?o. Tr?s visitas a campo foram realizadas no m?s de setembro de 2011 nos dias 13 (campo "a"), 21 (campo "b") e 29 (campo "c"), per?odo do ano com maiores velocidades de vento e uma em dezembro de 2011 no dia 08 (campo "d"), per?odo onde a velocidade do vento come?a a diminuir. Utilizaram-se coletores tipo "I" com abertura de 25 cm a partir do n?vel da superf?cie e "S" com abertura de 25 cm a 25 cm da superf?cie em seis pontos de coleta em duas das visitas ? campo nos dias 13 de setembro (campo "a") e 08 de dezembro (campo "d"), e tipo "T" com abertura de 50 cm a partir do n?vel da superf?cie nas demais visitas 21 e 29 de setembro (campo "b" e "c") ao longo do Campo de Dunas de Jenipabu. Foram tamb?m coletados dados meteorol?gicos com a utiliza??o de esta??o meteorol?gica port?til e complementados com dados da Esta??o Meteorol?gica de Natal que est? localizada a cerca de 12 km da ?rea de estudo para obter informa??es sobre a frequ?ncia e intensidade dos ventos, precipita??o e umidade relativa do ar da regi?o. Os sedimentos coletados foram tratados e foi calculada a vaz?o de fluxo de sedimentos (taxa de sedimenta??o). Em setembro a taxa sedimenta??o variou de 0,01 at? 11,39 Kg m-1 h-1 e em dezembro entre 0,33 e 1,30 Kg. m-1. h-1 nos coletores tipo "T". Nos coletores tipo "I" esses valores variaram entre 0,01 e 11,39 Kg m-1 h-1, enquanto que nos coletores tipo "S" de 0,01 a 0.73 Kg. m-1. h-1. De acordo com a an?lise estat?stica realisada percebe-se que o transporte de sedimento aumentou proporcionalmente a velocidade do vento em at? 25 cm da superf?cie. Por?m, essa rela??o n?o ? verdadeira acima de 25 cm do n?vel da superf?cie. O transporte de sedimentos ? mais intenso mais pr?ximo ? superf?cie onde foram encontradas taxas de sedimenta??o maiores que 10Kg. m-1. h-1 enquanto que a 25cm de dist?ncia o m?ximo encontrado foi menor que 3Kg. m-1. h-1, a quantidade de sedimento coletados aumenta ? medida que aumenta a velocidade no n?vel da superf?cie, ao se afastar da superf?cie a quantidade de sedimento essa rela??o n?o ? verdadeira
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Più fonti

Libri sul tema "Dune morphodynamics"

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Dłużewski, Maciej. Morfologia i morfodynamika barchanów w obszarach zwrotnikowych (na przykładzie Sahary): Morphology and morphodynamics of barchans in tropical regions (based on Sahara). Warszawa: Uniwersytet Warszawski, Wydział Geografii i Studiów Regionalnych, 2013.

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D'Alessandro, Felice, Giuseppe Roberto Tomasicchio e Ferdinando Frega, a cura di. Beach-Dune System Morphodynamics. MDPI, 2022. http://dx.doi.org/10.3390/books978-3-0365-5028-2.

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Aeolian and adhesion morphodynamics and phytoecology in Recent coastal and inland sand and snow flats and dunes from mainly North Sea and Baltic Sea to Mars and Venus. Frankfurt/Main: P. Lang, 1995.

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Mader, Detlef. Aeolian and Adhesion Morphodynamics and Phytoecology in Recent Coastal and Inland Sand and Snow Flats and Dunes from Mainly North Sea and Baltic Sea. P. Lang, 1994.

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Capitoli di libri sul tema "Dune morphodynamics"

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Kandrot, Sarah. "Terrestrial Laser Scanning for Monitoring and Modelling Coastal Dune Morphodynamics". In 3D Imaging of the Environment, 200–215. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9780429327575-13.

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Fedele, Juan J., e Marcelo H. García. "Alluvial Roughness in Streams with Dunes: A Boundary-Layer Approach". In River, Coastal and Estuarine Morphodynamics, 37–60. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-662-04571-8_3.

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Nishimori, Hiraku, e Masato Yamasaki. "A Minimal Model Approach for the Morphodynamics of Dunes". In Physics of Dry Granular Media, 347–52. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-017-2653-5_25.

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Kostaschuk, Ray. "Sediment transport mechanics and subaqueous dune morphology". In River, Coastal and Estuarine Morphodynamics. Taylor & Francis, 2006. http://dx.doi.org/10.1201/9781439833896.ch86.

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Métivier, Francois, Clément Narteau, Eric Lajeunesse e Olivier Rozier. "Modelling of dune patterns by short range interactions". In River, Coastal and Estuarine Morphodynamics. Taylor & Francis, 2006. http://dx.doi.org/10.1201/9781439833896.ch112.

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Termes, A., C. Dohmen-Janssen, S. Hulscher e A. Paarlberg. "A parameterization for flow separation in a river dune development model". In River, Coastal and Estuarine Morphodynamics. Taylor & Francis, 2006. http://dx.doi.org/10.1201/9781439833896.ch95.

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Blom, Astrid. "The impact of variability in dune dimensions on sediment sorting and morphodynamics". In River, Coastal and Estuarine Morphodynamics. Taylor & Francis, 2006. http://dx.doi.org/10.1201/9781439833896.ch94.

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Leclair, S., e J. Miller. "Time variation of probability distributions of dune-bed elevation in a large river". In River, Coastal and Estuarine Morphodynamics. Taylor & Francis, 2006. http://dx.doi.org/10.1201/9781439833896.ch87.

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Friedrich, H., A. Paarlberg e J. Lansink. "Evaluation of statistical properties of dune profiles". In River, Coastal and Estuarine Morphodynamics: RCEM 2007, Two Volume Set, 913–21. CRC Press, 2007. http://dx.doi.org/10.1201/noe0415453639-c116.

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Colombini, M., e A. Stocchino. "Bifurcation patterns in dune and antidune instability". In River, Coastal and Estuarine Morphodynamics: RCEM 2007, Two Volume Set, 949–57. CRC Press, 2007. http://dx.doi.org/10.1201/noe0415453639-c120.

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Atti di convegni sul tema "Dune morphodynamics"

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Gelovani, Irakli, George Lominadze, George Kavlashvili e Grigori Russo. "CONTEMPORARY MORPHODYNAMICS OF THE RIVER CHOROKHI DELTA ON THE BLACK SEA EAST COAST". In 24th SGEM International Multidisciplinary Scientific GeoConference 2024, 49–56. STEF92 Technology, 2024. https://doi.org/10.5593/sgem2024/5.1/s20.07.

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The River Chorokhi delta is located in the southeastern part of the Black Sea, including Batumi city with its coastal part, which today is heavily washed away. Until the 90s of the 20th century, its litho- and morphodynamic peculiarities were mainly conditioned by the solid runoff of the Chorokhi River. Before the construction of dams in Turkey, its volume was 2.5 million m?/per year. In the last 25 years, due to the dams built in Turkey, solid runoff has been catastrophically reduced by 60 times. Also important was the river-sea mouth migration. In the last century, as a result of the construction of a spur on the Batumi cape and the stopping of the alongshore sediment transport, the beach sediment was accumulating in both the above-water and underwater parts of the shore. As a result of upper limit accumulation of material, it is periodically deposited at great depths of the adjacent submarine canyon. There was clearly marked the trend of constant retreat with different rates of entire coastal part of the Chorokhi River delta, towards the land. It is necessary to remove the excess material accumulated near the Batumi Cape and artificially deposit it in other damaged areas as necessary so that the deep submergence of the distal part of the cape provoked by the 1999 earthquake in this area does not happen again. In modern city-building and agricultural activities, the peculiarities of local morphodynamics are often not taken into account. All this, against the background of the rise of the world ocean level, poses a serious threat to the coastal environment. In the conditions of the extreme shortage of solid runoff of the Chorokhi River, in order to preserve the coast, it is necessary to develop methods appropriate to the existing situation.
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Eftimova, Petya, Nikolay alchev, Bogdan Prodanov, Nataliya Andreeva, Todor Lambev e Lyubomir Dimitrov. "MODELLING OF HYDROMORPHOLOGICAL CHANGES DUE TO THE EFFECT OF FISHING PORT "KARANTINATA"". In 24th SGEM International Multidisciplinary Scientific GeoConference 2024, 145–56. STEF92 Technology, 2024. https://doi.org/10.5593/sgem2024/3.1/s12.18.

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Presence of coastal structures usually causes significant impacts to adjacent shores, especially when they are composed of sand. Many times, these impacts are associated with inappropriate design due to inadequate consideration of hydromorphological processes and system interactions. As a result, excessive erosion and/or deposition of sediment is observed, which implies costly, and in some cases, continuous maintenance. The study presents an assessment and gives explanation of significant changes in the morphology of Asparuhovo Beach (Varna Bay, Bulgarian Black Sea coast) occurred immediately after the construction of the fishing port "Karantinata". In only two-year period, the beach adjacent to the facility increased several times in width, significant amount of sediments accumulated on the submerged slope in front of the port entrance, silting it up to such an extent that only the smallest vessels can access the port. The study elucidates the pattern of hydrodynamic and morphodynamic regime in the area influenced by the port, allowing the prediction of future changes in the hydromorphology of Asparuhovo Beach.
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DORÉ, ARNAUD, PHILIPPE BONNETON, VINCENT MARIEU e THIERRY GARLAN. "MODELING OF THE MORPHODYNAMIC EVOLUTION OF SUBAQUEOUS SAND DUNES". In Coastal Sediments 2015. WORLD SCIENTIFIC, 2015. http://dx.doi.org/10.1142/9789814689977_0103.

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Ewing, Ryan C., Gary Kocurek, David Mohrig, Virginia Smith, M. Hildegard Reiser e David Bustos. "A DECADE OF THREE-DIMENSIONAL DUNE MORPHODYNAMIC OBSERVATIONS AT WHITE SANDS NATIONAL MONUMENT". In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-282341.

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Etri, Talal, e Roberto Mayerle. "MORPHODYNAMICS DUE TO STORMS SURGES IN A TIDALLY-DOMINATED COASTAL ENVIRONMENT". In Proceedings of the 31st International Conference. World Scientific Publishing Company, 2009. http://dx.doi.org/10.1142/9789814277426_0181.

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Millington, J. A., M. A. Fullen, G. M. Moore, C. A. Booth, I. C. Trueman, A. T. Worsley e N. Richardson. "Morphodynamics of the Morfa Dyffryn coastal dunes, mid-Wales: photographic survey 1988–2007". In COASTAL ENVIRONMENT 2008. Southampton, UK: WIT Press, 2008. http://dx.doi.org/10.2495/cenv080201.

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Ding, Yan, Keh-Chia Yeh, Hung-Kwai Chen e Sam S. Y. Wang. "Simulations of Morphodynamic Changes Due to Waves and Tides in an Estuary Using CCHE2D-Coast Model". In World Environmental and Water Resources Congress 2007. Reston, VA: American Society of Civil Engineers, 2007. http://dx.doi.org/10.1061/40927(243)102.

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Кремез, В., V. Kremez, В. Островерх e V. Ostroverh. "ON THE METHODS OF ESTUARINE AND COASTAL MORPHODYNAMICS WITH NUMERICAL AND GEOINFORMATICAL SYSTEMS". In Sea Coasts – Evolution ecology, economy. Academus Publishing, 2018. http://dx.doi.org/10.31519/conferencearticle_5b5ce3cca6d662.10106976.

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The questions on kinematics and morphodynamics of estuarine zones assessment are considered with help of numerical and GIS methods for natural and construction systems monitoring. The monitoring is fulfilled on the basis of the time-spatial database for estuarine part of Danube to Black Sea navigational canal trough the Bystry branch of Cilia delta. To the database we include not only river and reservoir shores and depth but the constantly acting hydrometeorogical parameters as well. The database is used for river and canal navigation analysis, coastal line and fairway stability.As a result we propose the recommendations on protection and training dike structures due to the principle of natural analog type constructures for dredging, seawater rejection and soil deposits utilization as material for artificial offshore structures
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Eftimova, Petya, Nikolay Valchev, Nataliya Andreeva, Bogdan Prodanov e Lyubomir Dimitrov. "IMPACT ASSESSMENT OF THE NEW FISHING PORT ON THE HYDRO AND MORPHODYNAMIC REGIME IN CHERNOMORETS BAY". In 23rd SGEM International Multidisciplinary Scientific GeoConference 2023. STEF92 Technology, 2023. http://dx.doi.org/10.5593/sgem2023/3.1/s12.10.

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Since putting in operation of Chernomorets fishing port (Sozopol municipality, southern Bulgarian Black Sea coast) in January 2016, a number of negative effects have been observed in the area. The disturbance in the existing hydrodynamic balance led to intense coastal erosion and unwanted sand accumulation in the wave shadow area. Additionally, the coastal water quality has deteriorated in the port area. In order to undertake measures to mitigate the observed adverse effects, it is necessary to assess in detail the impact of the new facility on the hydrodynamic and morphodynamic regime in Chernomorets Bay. The assessment was done through geospatial morphological analysis based on satellite images, historical and present field observations, on one hand, and hydrodynamic and morphodynamic modelling, on the other one, which took into account the setting before and after the port construction. Typical seasonal wave conditions, related sea level variations, and a real storm situation based on field measurements during a storm surge event were simulated. The geospatial morphological analysis shows that there was a balance in the distribution of sandy material along the beach before the port construction. After the construction, a fast modification of the beach and bottom slope morphology has taken place resulting in ever increasing erosion in the north-western and western part of the bay and accumulation in the central and south-eastern one, accompanied by slope flattening. The modelling showed that the effect of the new port on the sediment dynamics is significant and completely irreversible in natural manner. This is due to the severely reduced natural system control on sediment fluxes balance. The presently observed beach erosion and coastal abrasion are expected to pursue, thus expanding the affected by both erosion and unwanted accumulation areas.
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Fomin, Vladimir, Vladimir Fomin, Konstantin Gurov, Konstantin Gurov, Vladimir Udovik, Vladimir Udovik, Sergey Konovalov e Sergey Konovalov. "DYNAMICS OF THE NEARSHORE ZONE OF KALAMITSKIY GULF (BLACK SEA) UNDER INFLUENCE OF WIND WAVES". In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.31519/conferencearticle_5b1b948b20d587.32401065.

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Coastal zone dynamics is especially interesting for interdisciplinary researchers. This is due to general retreat of the coast of the Western Crimea and the fast response in the beach ar-ea. This justifies the need for monitoring of morphodynamic processes in the coastal zone of Crimea with the aim of qualitative and quantitative assessments of modern coastal trans-formation, as well as forecasts of possible changes. XBeach model has been used to simulate dynamics of waves and currents, sediment transport and changes in bottom topography, as well as the processes of drying and flooding of coastal areas. Erosion and sedimentation processes for the bottom sediments of the coastal zone of the Western Crimea have been numerically studied. The bottom profile has been reconstructed on the basis of bathymetric investigations in the coastal zone of the Western Crimea. Numerical simulations have been performed for various parameters of the bed composition and wind waves. Two fractions of bottom sediments have been considered for numerical experiments. The obtained results show that XBeach model can be successfully applied to simulate the bed profile evolution and changes in bottom sediment fractionation.
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Rapporti di organizzazioni sul tema "Dune morphodynamics"

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Brodie, Katherine, Ian Conery, Nicholas Cohn, Nicholas Spore e Margaret Palmsten. Spatial variability of coastal foredune evolution, part A : timescales of months to years. Engineer Research and Development Center (U.S.), luglio 2021. http://dx.doi.org/10.21079/11681/41322.

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Coastal foredunes are topographically high features that can reduce vulnerability to storm-related flooding hazards. While the dominant aeolian, hydrodynamic, and ecological processes leading to dune growth and erosion are fairly well-understood, predictive capabilities of spatial variations in dune evolution on management and engineering timescales (days to years) remain relatively poor. In this work, monthly high-resolution terrestrial lidar scans were used to quantify topographic and vegetation changes over a 2.5 year period along a micro-tidal intermediate beach and dune. Three-dimensional topographic changes to the coastal landscape were used to investigate the relative importance of environmental, ecological, and morphological factors in controlling spatial and temporal variability in foredune growth patterns at two 50 m alongshore stretches of coast. Despite being separated by only 700 m in the alongshore, the two sites evolved differently over the study period. The northern dune retreated landward and lost volume, whereas the southern dune prograded and vertically accreted. The largest differences in dune response between the two sections of dunes occurred during the fall storm season, when each of the systems’ geomorphic and ecological properties modulated dune growth patterns. These findings highlight the complex eco-morphodynamic feedback controlling dune dynamics across a range of spatial scales.
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